I'm at war with Isabella, we're side by side (she's west) and Montezuma is to the northwest. He brought me into the war, but a couple of turns later pusses out, which I don't notice. So I have a vital city sitting on Isabella's border with only two musketmen in it. I figure, Montezuma's reinforcements should be coming anytime now, I'm fine. So 4 catapults and 4 swordsmen pop out from Izzy's border. Foolishly, I'm still not concerned. Those super strong musketmen will hold them off! She doesn't attack for a couple turns, and then 4 musketmen of hers pop out of the shadows. By this time I'm like "OH $#%@!" and realize my massive army of cavalry is standing to the south defending the coast from a galley that she sent over. City razed. Moral: Two musketmen defending the prime attack front=not a good idea.